EP2569581B1 - Attenuating section for sound attenuator in air conditioning duct and sound attenuator for air conditioning duct - Google Patents

Attenuating section for sound attenuator in air conditioning duct and sound attenuator for air conditioning duct Download PDF

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Publication number
EP2569581B1
EP2569581B1 EP11780274.4A EP11780274A EP2569581B1 EP 2569581 B1 EP2569581 B1 EP 2569581B1 EP 11780274 A EP11780274 A EP 11780274A EP 2569581 B1 EP2569581 B1 EP 2569581B1
Authority
EP
European Patent Office
Prior art keywords
air conditioning
attenuating
section
conditioning duct
attenuation element
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP11780274.4A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2569581A1 (en
EP2569581A4 (en
Inventor
Seppo Vartiainen
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Jeven Oy
Original Assignee
Jeven Oy
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Jeven Oy filed Critical Jeven Oy
Priority to PL11780274T priority Critical patent/PL2569581T3/pl
Publication of EP2569581A1 publication Critical patent/EP2569581A1/en
Publication of EP2569581A4 publication Critical patent/EP2569581A4/en
Application granted granted Critical
Publication of EP2569581B1 publication Critical patent/EP2569581B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0336—Noise absorbers by means of sound-absorbing materials
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/027—Throttle passages
    • F16L55/02763—Throttle passages using an element with multiple tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/02—Energy absorbers; Noise absorbers
    • F16L55/033—Noise absorbers
    • F16L55/0331—Noise absorbers by inserting an elongated element in the pipe
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/02—Ducting arrangements
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/24—Means for preventing or suppressing noise

Definitions

  • the invention relates to an attenuating section for a sound attenuator for an air conditioning duct according to the preamble of claim 1.
  • the invention also relates to a sound attenuator for an air conditioning duct according to the preamble of claim 9.
  • Such a sound attenuator usually comprises one or more elongated air ducts or openings going through the sound attenuator, a housing implemented of sheet metal or equivalent and an attenuating section including foam plastic, mineral wool or equivalent sound-attenuating material which is arranged as a uniform layer between the air duct and the housing.
  • a sound attenuator usually comprises one or more elongated air ducts or openings going through the sound attenuator, a housing implemented of sheet metal or equivalent and an attenuating section including foam plastic, mineral wool or equivalent sound-attenuating material which is arranged as a uniform layer between the air duct and the housing.
  • a problem of the above sound attenuators is especially their installation in the air conditioning duct.
  • a special fitting section such as an extension section, into connection with which the sound attenuator is installable.
  • pressure loss over the sound attenuator must also be considered, which pressure loss in the above sound attenuators is considerably large.
  • the large pressure loss requires an efficient air-transfer arrangement, such as blowers, and this increases the power consumption of the air conditioning system.
  • Another problem of the above sound attenuators is their structure and relatively large manufacturing costs incurred by it.
  • the object of the invention is to eliminate problems related to the above described sound attenuators and their installation in air conditioning ducts.
  • Another object of the invention is to provide a novel improved attenuating section for a sound attenuator for an air conditioning duct.
  • the attenuating section for the sound attenuator in the air conditioning duct according to the invention is characterised by what is presented in claim 1.
  • the sound attenuator for the air conditioning duct according to the invention is characterised by what is presented in claim 9.
  • the invention relates to an attenuating section for a sound attenuator for an air conditioning duct which attenuating section is implemented of elastic and sound-attenuating material.
  • the attenuating section comprises at least one attenuation element which is provided with a permanent magnet arrangement by means of which the attenuating section is to be detachably fastened to the housing section of the sound attenuator.
  • the housing section of the sound attenuator is arranged as a part of the air conditioning duct i.e. the duct pipe frame on the inner wall of which one or more attenuation elements are fastenable with the permanent magnet arrangement.
  • the attenuating section comprises at least one laminar attenuation element on one narrow side of which is arranged a set of permanent magnet fasteners to implement the permanent magnet arrangement.
  • the attenuation element is fastened in its longitudinal direction on the inner wall of the housing section, most advantageously the pipe frame of the air conditioning duct, in the flow direction of air.
  • the attenuating section comprises at least one cylindrical, advantageously tubular, attenuation element onto the housing of which on at least one straight line in the longitudinal direction of the attenuation element is arranged a set of permanent magnet fasteners to implement the permanent magnet arrangement.
  • the attenuation element is fastened in its longitudinal direction on the inner wall of the housing section, most advantageously the pipe frame of the air conditioning duct, in the flow direction of air.
  • the invention also relates to a sound attenuator for an air conditioning duct which is to be fitted in the air conditioning duct to attenuate duct sounds
  • sound attenuator comprises a housing section which is implemented from a part of the air conditioning duct, particularly its pipe frame; and an attenuating section which is of elastic and sound-attenuating material and fitted within the housing section.
  • the attenuating section is implemented according to a patent claim related to the attenuating section and fastened on the inner wall of the housing section and simultaneously the air conditioning duct with a permanent magnet arrangement, particularly with permanent magnet fasteners.
  • An advantage of the invention is particularly the easy installability and serviceability of the sound attenuator.
  • An advantage of the invention is the simple structure and manufacturing-friendliness.
  • An advantage of the invention is also the efficient sound attenuation in the air conditioning duct.
  • a sound attenuator 2 for an air conditioning duct is in Figs. 1 and 2 fitted in an air conditioning duct 1 and its purpose is to attenuate noise and other disturbing sounds being carried along the duct.
  • the sound attenuator 2 comprises a housing section 30 and an attenuating section 3.
  • the housing section 30 is most advantageously implemented from a part of the air conditioning duct, particularly its pipe frame 10.
  • the attenuating section 3 is implemented of elastic and sound-attenuating material and fitted within the housing section 10, 30.
  • the attenuating section 3 of the sound attenuator 2 comprises at least one attenuation element 31 which is provided with a permanent magnet arrangement 4; 41 by means of which the attenuating section is to be detachably fastened to the housing section 10, 30 of the sound attenuator, particularly on its inner wall 11. Then, the housing section 10, 30 is implemented of ferromagnetic material, such as galvanised sheet metal. It should be noticed that air conditioning ducts are mainly implemented particularly of material of said type.
  • the attenuating section 3; 3 1 comprises at least one first i.e. laminar attenuation element 31; 31 a on one narrow side 311 simultaneously longitudinal of the attenuation element E-E is arranged a set of permanent magnet fasteners 41; 411, 412 to implement a permanent magnet arrangement.
  • the attenuation element 31; 31 1 is fastened in its longitudinal direction E-E on the inner wall 11 of the housing section 30, most advantageously the pipe frame 10 of the air conditioning duct 1, and particularly in the flow direction of air A.
  • the shape of the first attenuation element 31; 31 a is advantageously a plate, most advantageously a straight and flat sheet which is fitted in the air conditioning duct 1 the large straight sheet surfaces i.e. wide sides 312 in the flow direction of air A.
  • the sound attenuator 2 advantageously comprises a set of attenuation elements 31; 31 a by means of which the sound attenuator is divided into a set of elongated parallel attenuating ducts 32.
  • a height b of the first attenuation element 31; 31 a of the attenuating section 3 and simultaneously a width of the wide side 312 perpendicularly against the longitudinal direction E-E of the attenuation element (and simultaneously against the longitudinal direction of the air conditioning duct 1 and the flow direction of air A) is at the most 70% of an inner diameter h of the housing section 10, 30. Then, fitting and installing the attenuation element 31; 31 a in place within the housing section 10, 30 is simple and easy. Furthermore, several attenuation elements 31; 31 a can be installed at the same point and parallel on different sides of the inner wall 11 of the housing section.
  • a length L of the first attenuation element 31; 31 a of the attenuating section 3 in the longitudinal direction E-E of the attenuation element is at least five times the height b of the attenuation element.
  • the long attenuation element 31 operates as a better sound attenuator than a short one. Additionally, the long attenuation element is most advantageously provided with several permanent magnet fasteners, whereby it stays very well in place and in a desired position fastened to the housing section 10, 30.
  • the height b of the first attenuation element 31; 31 a of the attenuating section 3 is at least three times a thickness s of the attenuation element.
  • the thickness s is a dimension being against the height b and the wide side 312 of the attenuation element 31; 31 a in the perpendicular direction.
  • the attenuating section 3; 3 1 includes several first i.e. laminar attenuation elements 31; 31 a, they are fitted on different sides of the inner wall 11 of the housing section 10, 30 at suitable angular distances separate from each other.
  • the attenuation elements 31; 31 a are fitted in an exemplifying embodiment in parallel in the same cylindrical circumferential area of the housing section, whereby they form a star-shaped attenuating section 3; 3 1 extending outwards from the central axis of the housing section 30.
  • Between the attenuation elements 31; 31 a are then left the attenuating ducts 32 along which the air flow of the air conditioning duct is able to flow with relatively low resistance and small pressure loss.
  • the attenuation elements 31; 31 a are fitted at suitable angular distances on the cylindrical circumferential area of the housing section but such that they are at least partially successive (and thus partially parallel) in the longitudinal direction of the air conditioning duct and the flow direction of air A.
  • first attenuation elements 31; 31 a such as straight attenuator sheets, can be different of their height b, length L and thickness even in the one and the same attenuating section 3; 3 1 of the sound attenuator 2.
  • the attenuating section 3; 3 2 comprises at least one second i.e. cylindrical, such as tubular, attenuation element 31; 31 b in the housing of which on at least one straight line in the longitudinal direction E-E of the attenuation element is arranged the set of permanent magnet fasteners 41; 411, 412 to implement the permanent magnet arrangement 4.
  • the attenuation element 31; 31 b is fastened in its longitudinal direction E-E on the inner wall 11 of the housing section 30, most advantageously the pipe frame 10 of the air conditioning duct, in the flow direction of air A.
  • the cross section of the cylindrical, advantageously tubular, attenuation elements 31; 31 b is circular in the shown exemplifying embodiment, but it can also be a polygon, advantageously a regular polygon.
  • the housing of the tubular attenuation element is advantageously relatively thick compared to the outer diameter of the attenuation element; the thickness of the housing and the diameter of the centre opening are e.g. equal, whereby the outer diameter is 3 times the thickness of the housing.
  • the attenuation elements 31; 31 b are of the shape of straight pipes having a relatively thick (in relation to the diameter) housing of sound-attenuating material.
  • the attenuation elements 31 b are connectable to each other in the installation stage e.g. with second permanent magnet fasteners which are equivalent to the above permanent magnet fasteners 41; 411, 412, whereby the attenuating section 3; 3 2 can be implemented as a tight unit.
  • the second attenuation elements 31; 31 b are fitted at suitable angular distances on the cylindrical circumferential area of the housing section but such that they are at least partially successive (and thus partially parallel) in the longitudinal direction of the air conditioning duct and the flow direction of air A.
  • the one and the same attenuating section 3 of the sound attenuator 2 is implementable with one or more both first and second attenuation elements 31; 31 a, 31 b.
  • the permanent magnet arrangement 4 of the attenuating section 3; 3 1 , 3 2 is most advantageously implemented such that the attenuation element 31; 31 a, 31 b is provided with a permanent magnet fastener 41.
  • the permanent magnet fasteners 41; 411, 412 are arranged at a suitable distance from each other on that side or half of the attenuation element 31; 31 a, 31 b which is to be fitted against the inner wall 11 of the housing section 10, 30 and further most advantageously on a straight line in the longitudinal direction E-E of the attenuation element, as illustratively visible in Figs. 1, 2 , 4 and 5 .
  • the housing section 30 is in this case implemented of galvanised sheet metal or equivalent ferromagnetic material, the permanent magnet fasteners 41 keep the attenuation elements 31; 31 a, 31 b tightly fast on the inner wall 101 of the duct.
  • the air conditioning ducts 1 are mainly implemented of galvanised sheet metal, whereby the permanent magnet fasteners 41 also operate and keep the attenuation elements 31; 31 a, 31 b tightly fast on the inner wall 11 of the pipe frame 10 of the air conditioning duct operating as the housing section 30.
  • the permanent magnet fasteners 41; 411, 412 are relatively small pieces of magnet with the area e.g. of 10 x 20 mm and with an even outwards-directed surface.
  • the permanent magnet fasteners 41; 411, 412 are arranged at a distance from each other on the outer surface of the attenuation element 31; 31 a, 31 b. They are fastened in a recess 5 (or on the outer surface) arranged in the attenuation element 31; 31 a e.g. by gluing with suitable glue (see Fig. 3A ).
  • the permanent magnet fasteners 41; 411, 412 are fastened in place on the outer surface (or recess) of the attenuation element 31; 31 a, 31 b with a suitable mechanical fastening element, e.g. a screw 6 (see Fig. 3B ).
  • the permanent magnet fasteners 41; 411, 412 are implemented of suitable permanent-magnet ferromagnetic material.
  • the permanent magnet fasteners 13 are super magnets, whereby the materials of which they are most advantageously manufactured are neodymium-ferro-borium-based (NdFeB) alloys. By means of these materials, the permanent magnet fastener 41; 411, 412 achieves sufficient fastening force, long lifetime and high heat tolerance, up to 80°C.
  • the installation of the attenuating section 3, 3 1 , 3 2 is most advantageously implemented via an opening provided with a hatch, arranged to the air conditioning duct, particularly its frame section.
  • the hatch is e.g. an inspection cover of the air conditioning duct.
  • the opening can be opened and closed air-tightly.
  • the shape of the opening is e.g. a rectangle (or alternatively some other suitable geometric shape, such as an ellipse) the length of which equals at least nearly the diameter of the air conditioning duct and the width of which is within the same range.
  • one or more attenuation elements 31 of the attenuating section 3 of the sound attenuator 2 is fittable within the air conditioning duct and fastenable with the permanent magnet fasteners 41 at a suitable point on the inner wall 11 of the frame section 10. In an equivalent way vice versa, one or more attenuation elements 31 can be detached and taken out of the air conditioning duct 1.
  • the attenuation element 31 a, 31 b of the attenuating section 3; 3 1 , 3 2 of the sound attenuator 2 is of suitable elastic and sound-attenuating material, such as foam plastic material, mineral wool or equivalent.
  • the fixed cross-sectional area of the attenuating section 3 of the sound attenuator 2 is at its maximum about 20% of the cross-sectional area of the air conditioning duct 1.
  • the cross-sectional area of the parallel attenuating ducts 32 of the attenuating section 31 of the sound attenuator 2 is then about 80% of the cross-sectional area of the air conditioning duct 1.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Duct Arrangements (AREA)
  • Air-Flow Control Members (AREA)
EP11780274.4A 2010-05-12 2011-05-12 Attenuating section for sound attenuator in air conditioning duct and sound attenuator for air conditioning duct Not-in-force EP2569581B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL11780274T PL2569581T3 (pl) 2010-05-12 2011-05-12 Sekcja tłumiąca do tłumienia dźwięku w przewodzie klimatyzacyjnym oraz tłumik dźwięku do przewodu klimatyzacyjnego

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FI20105526A FI124494B (fi) 2010-05-12 2010-05-12 Vaimennusosa ilmanvaihtokanavan äänenvaimenninta varten ja ilmanvaihtokanavan äänenvaimennin
PCT/FI2011/050437 WO2011141639A1 (en) 2010-05-12 2011-05-12 Attenuating section for sound attenuator in air conditioning duct and sound attenuator for air conditioning duct

Publications (3)

Publication Number Publication Date
EP2569581A1 EP2569581A1 (en) 2013-03-20
EP2569581A4 EP2569581A4 (en) 2014-04-30
EP2569581B1 true EP2569581B1 (en) 2016-01-13

Family

ID=42234309

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11780274.4A Not-in-force EP2569581B1 (en) 2010-05-12 2011-05-12 Attenuating section for sound attenuator in air conditioning duct and sound attenuator for air conditioning duct

Country Status (5)

Country Link
EP (1) EP2569581B1 (fi)
DK (1) DK2569581T3 (fi)
FI (1) FI124494B (fi)
PL (1) PL2569581T3 (fi)
WO (1) WO2011141639A1 (fi)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FI20106219A (fi) * 2010-11-18 2012-05-19 Flaekt Woods Ab Eriste ilmanvaihdon tasauslaatikkoa varten
RU208307U1 (ru) * 2021-08-02 2021-12-13 федеральное государственное бюджетное образовательное учреждение высшего образования "Национальный исследовательский университет "МЭИ" (ФГБОУ ВО "НИУ "МЭИ") Пластинчатый глушитель шума

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2620169A1 (de) 1976-05-07 1977-11-10 Gruenzweig Hartmann Glasfaser Schalldaempfer fuer rohrleitungen
HU182491B (en) 1977-04-08 1984-01-30 Fuetoeber Epueletgep Termekek Sound-damping deviceparticularly for reducing noise spreading in air duct
SE447413B (sv) 1984-12-11 1986-11-10 Viak Ab Ljuddempare for reducering av kanalburet luftljud
FI91995C (fi) 1990-11-20 1994-09-12 Valmet Paper Machinery Inc Absorptiivinen äänenvaimennin, etenkin paperitehtaiden ilmakanaviin
FI95747B (fi) 1991-01-17 1995-11-30 Valmet Paper Machinery Inc Matalien taajuuksien äänenvaimennin paperitehtaiden ilmakanaviin
US6644061B1 (en) * 2002-08-02 2003-11-11 Joseph W. Woolfson Sound muffling device for an air conditioning unit
US20080160904A1 (en) * 2006-12-27 2008-07-03 Yi Christopher S Air cap and diffuser assembly

Also Published As

Publication number Publication date
PL2569581T3 (pl) 2016-06-30
FI20105526A (fi) 2011-11-13
EP2569581A1 (en) 2013-03-20
FI124494B (fi) 2014-09-30
FI20105526A0 (fi) 2010-05-12
WO2011141639A1 (en) 2011-11-17
EP2569581A4 (en) 2014-04-30
DK2569581T3 (en) 2016-03-21

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